69 lines
2.7 KiB
PL/PgSQL
69 lines
2.7 KiB
PL/PgSQL
CREATE OR REPLACE FUNCTION pricequote.pick_last_price_from_hist(
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hist JSONB,
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v1ds TEXT
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)
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RETURNS JSONB AS $$
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DECLARE
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dsq JSONB := (hist -> v1ds) -> 'dsq';
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dss JSONB := (hist -> v1ds) -> 'dss';
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mrq JSONB := hist -> 'mrq';
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mrs JSONB := hist -> 'mrs';
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result JSONB;
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BEGIN
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-- Central control for age threshold
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DECLARE
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age_threshold INTERVAL := INTERVAL '18 months';
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dsq_date DATE := NULL;
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dss_date DATE := NULL;
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mrq_date DATE := NULL;
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mrs_date DATE := NULL;
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best JSONB := NULL;
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best_date DATE := NULL;
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BEGIN
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-- set dates
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IF dsq IS NOT NULL AND (dsq->>'price') IS NOT NULL THEN
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dsq_date := (dsq->>'odate')::date;
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END IF;
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IF dss IS NOT NULL AND (dss->>'price') IS NOT NULL THEN
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dss_date := (dss->>'odate')::date;
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END IF;
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IF mrq IS NOT NULL AND (mrq->>'price') IS NOT NULL THEN
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mrq_date := (mrq->>'odate')::date;
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END IF;
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IF mrs IS NOT NULL AND (mrs->>'price') IS NOT NULL THEN
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mrs_date := (mrs->>'odate')::date;
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END IF;
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-- 1. Prefer the most recent of dss/dsq if either is within the age threshold
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IF dss_date IS NOT NULL AND dss_date > (CURRENT_DATE - age_threshold) THEN
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result := dss || jsonb_build_object('source', 'dss');
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-- 2. If both dss/dsq are older than the threshold, use the most recent of mrs/mrq if either exists
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ELSIF mrs_date IS NOT NULL AND mrs_date > (CURRENT_DATE - age_threshold) THEN
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result := mrs || jsonb_build_object('source', 'mrs');
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-- 3. If all are at least as old as the threshold, pick the least oldest price available
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ELSE
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best := NULL;
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best_date := NULL;
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-- IF dsq_date IS NOT NULL THEN
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-- best := dsq || jsonb_build_object('source', 'dsq');
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-- best_date := dsq_date;
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-- END IF;
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-- IF dss_date IS NOT NULL AND (best_date IS NULL OR dss_date > best_date) THEN
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-- best := dss || jsonb_build_object('source', 'dss');
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-- best_date := dss_date;
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-- END IF;
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-- IF mrq_date IS NOT NULL AND (best_date IS NULL OR mrq_date > best_date) THEN
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-- best := mrq || jsonb_build_object('source', 'mrq');
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-- best_date := mrq_date;
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-- END IF;
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-- IF mrs_date IS NOT NULL AND (best_date IS NULL OR mrs_date > best_date) THEN
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-- best := mrs || jsonb_build_object('source', 'mrs');
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-- best_date := mrs_date;
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-- END IF;
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result := best;
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END IF;
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RETURN result;
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END;
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END;
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$$ LANGUAGE plpgsql IMMUTABLE;
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